Keyboard controls

    Left / Reight   - Previos / next image
    Up / Down       - Image above / below
    Space           - Mark image (also shift-click)
    Ctrl-A          - Mark all images
    Ctrl-D          - Unmark all images
    Ctrl-I          - Reverse image marks
    Enter           - Toggle lightbox
    Esc             - Close image info or lightbox
    Delete          - Toggle image / marked for deletion (toggle)
    Shift-Delete    - Delete marked image(s) or current if none are marked

NOTE: if the grid behaves in an odd way on resize tweak PATCH_MARGIN value,
	though this sould not be necessary.
	(optimal range >1 and <3)	
NOTE: the "basic actions" below are to be moved to the toolbar...

For more info see: README.md

Settings and debug controls